*{
    margin:0;
    padding:0;
    list-style: none;
    box-sizing: border-box;
}

.wrap{
    width:800px;
    margin: auto;
}

table{
    width:100%;
    text-align: center;
    border-collapse: collapse;
}

.mask{
    width:100%;
    height:100%;
    position: fixed;
    left:0;
    top:0;
    background: rgba(0,0,0,.5);
}
.content{
    position: fixed;
    top:50%;
    left:50%;
    background: #fff;
    transform: translate(-50%,-50%);
    padding:20px;
    width:340px;
    
}
.content h1 span{
    float: right;
}
.content input{
    width:300px;
    height:40px;
    border: 1px solid #ccc;
}
.content button{
    float: right;
    margin-top: 20px;
    width:80px;
    height:40px;
}